Commands icons disappears on second Whiskermenu

I use xfce4 with labwc on Wayland. Panel is forced to internal mode.

I use external monitor next to my laptop, both screens have a panel with whiskermenu as first item.

On the left screen (laptop) instance all is fine. At the right (monitor) the whiskermenu cannot handle the commands icons.

At the first launch of right whiskermenu, all (enabled and disabled) command icons are visible. At the second launch all icons disappears.

Both whiskermenu have same command icons activated in settings: Settings, Lock, Switch User, Logout. If I enable a command for the laptop panel, I see it enabled on monitor panel too in settings.